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agasfer [191]
4 years ago
12

Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 89.

Mathematics
2 answers:
grigory [225]4 years ago
8 0
Just add 19 to 140.
White raven [17]4 years ago
6 0
She can use this double by first finding the different in between 70 and 89, which is 19. After finding that difference she should add 19 to the result of the double.
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Find the sum of the arithmetic sequence 1, 3, 5, 7, … , 99.
bezimeni [28]

The sum of the arithmetic sequence 1, 3, 5, 7, … , 99 is 2525

<h3>What is Sequence?</h3>

Sequence is an enumerated collection of objects in which repetitions are allowed and order matters.

Given sequence is 1, 3, 5, 7, … , 99.

It is a arithmetic sequence, the difference between two consecutive terms will be same

d=3-1=2

first term a=1

l=last term =99

We need to find 99 is which term in the sequence

Aₙ = a + ( n - 1 ) d

99=1+(n-1)2

99=1+2n-2

99=2n-1

100=2n

Divide both sides by 2

50=n

Now we need to find the sum of 50 terms

Sₙ=n/2(l+d)

=50/2(99+2)

=25(101)

=2525

Hence, the sum of the arithmetic sequence 1, 3, 5, 7, … , 99 is 2525

To learn more on Sequence click:

brainly.com/question/21961097

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6 0
1 year ago
Guys plz help me answer this!!!
ddd [48]

Answer:           number 2

cuz its the only one that makes sense

5 0
3 years ago
What is the answer for this please 23÷23​
baherus [9]

Answer:

1

Step-by-step explanation:

Any number divided by itself equals 1. So, 23 divided by 23 is 1.

8 0
2 years ago
The nine cats in a pet store were weighed. Their weights (in pounds) are given below.
stepladder [879]
Range is 6 and the mode is 8
6 0
3 years ago
A sequence is defined recursively using the formula f(n + 1) = –0.5 f(n) . If the first term of the sequence is 120, what is f(5
Svetllana [295]
7.5
f(1) = 120
f(2) = -60
f(3) = 30
f(4) = -15
f(5) = 7.5
6 0
4 years ago
Read 2 more answers
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